Viewing profile — mattb314

Super rough summary of the first half: in order to pick out random vectors with a given shape (where the "shape" is determined by the covariance matrix), MASS::mvrnorm() computes s…

The idea is that memory-only data systems like HyPer are able to make design decisions that make them significantly faster that disk-based systems (eg postgres), even when the work…

Wonder if this has anything to do with the sliding window: > Sonic only keeps the N most recently pushed results for a given word, in a sliding window way (the sliding window width…

> Joules-Thomson effect is what allows for refrigeration I don't think this is true. The "simple" model of refrigeration taught in highschool is just a carnot cycle running backwar…

Heads up this weights all your scores towards 0. If you want to avoid this, an equally simple approach is to use (x+3)/(y+5) to weight towards 3/5, or any (x+a)/(y+b) to weight tow…

Free fillable forms is hard to use for taxes in general, but this page is specifically for people who want the CTC without having filed taxes (presumably you otherwise would have g…

I doubt it? At least the number times the "last updated" column appears on SQL server stats [1] leads me to believe it collects stats async with updates to the table. The only syst…

I think I generally agree with the majority of the comments here that burn in can serve a useful purpose (especially if you can't find a high probability density point to start fro…

If you're new to differential privacy and looking for an introduction, I highly recommend the Dwork and Roth book, especially the first three chapters: https://www.cis.upenn.edu/~a…

Personally I'm not super bullish on differential privacy outside a couple specific use cases, but correlation attacks and cross referencing against external data are exactly the ve…

I'd also like an answer to this one. It seems like most of these explanations would also apply to plastic or metal getting wet, so why does cloth get so much darker than other mate…

This is basically the issue. If a single line from the bottom of left is present at the top of right, it will fast-forward all the way through left and fail to match anything else …

re: efficiency, I think this blog post does a decent job explaining: https://auth0.com/blog/beating-json-performance-with-protobu... . Basically, it doesn't make a huge difference …

I might be missing some context here, but usually the L_infinity norm means the max norm, or the maximum absolute difference over all components (data points). This gives (min + ma…

To be honest, I'm a little confused by your answer. Aren't high contention and deadlocking workloads essentially the same thing to a deadlock-detection db? I can imagine some patte…

Does anyone know why they use deadlock detection rather than deadlock avoidance (the simplest avoidance algorithm being simply to always acquire locks in the same order)? I can't f…

Even assuming you meant "upper bound" instead of "lower bound", this isn't strictly true in theory. To achieve high throughput with large latency between nodes, all you have to do …

I'm a little confused about the columnar database comment: > Performing queries across billions of metrics looking for labels that only match a few of them (a common scenario with …

Worth noting that (I'm 99% sure) you're absolutely allowed to benchmark Oracle, just not publish the results publicly. It's pretty common for DB papers to compare against postgres …

Could you link/explain how you get those hardware prices, specifically the servers and desktops? Are the available for the average consumer (ie not making a bulk purchase)? I have …

I think the idea of spending to upgrade your helper AI sounds really interesting and potentially novel, but it's important to push back a little bit on the idea of "removing all th…

I'm certainly not long on uBeam (even after this fragile demo), but what physics dictates that it won't work? Sure, you're certainly going to take an efficiency loss, but wall outl…

Thanks! This talk is pretty cool. In case anyone else is interested, in addition to the above video, this [1] paper goes into some of the details, including this explanation: "Read…

Do you think you could point me towards a source for "mixing reads & writes with a SSD lowers performance"? This seems reasonable, but I've never actually heard it before, and a cu…

Slightly related question from a non-expert in ad-blocking: is it possible to block interstitial ads? While the freedom to render a page as you wish seems to come with controlling …